Say I wanted to see the profile of all the users who are from particular college or from particular place, can I do that on codeforces? If yes, how? If no, then why not to add such a thing?

I started codeforces 5-6 months ago. Since then I am a regular here and I have done 13 contests till now but now I get a feeling that my rating has got stuck in this range of 1550-1630. I have basic knowledge of algorithms like dynamic programming (to some extent) and graph algorithms. But only sometimes I am able to solve Div2 C and almost never Div2 D and Div2 E. Any advice on how should I practice to improve form here? I tried to solve dp problems in problemset in descending order of number of submissions. Now I have done page 1. Should I continue to page 2 or should I solve other types of problems now like bitmasking, max flows? And also, will this kind of practice actually help me at all?

Thanks for any help.